· RADAR and SONAR – to generate signal that will be transmitted and received back

· RF (Radio Frequency) or AF (Audio Frequency) signal generators

Thus we may list out number of such applications where sine wave oscillators are used. In addition I would say the signal communication is impossible without oscillators.

There are different kinds of Sine wave oscillators based on the components used or based on the output frequency that they generate

1. Based on components means if they produce oscillation using resistors (R) and capacitors (C) then they are called RC oscillators and if they use inductor (L) and capacitor (C) then they are termed as LC oscillators

2. Based on output frequency means if they generate frequency in audio range (20 Hz – 20 KHz) then they are Audio Frequency (AF) oscillators. If they generate frequency in low range (100 – 200 KHz) then they are called Low Frequency (LF) oscillators and last, if they generate frequency in high range (in MHz or GHz) then they are termed as High frequency (HF) or Radio Frequency (RF) oscillators.